Calibrate a boom or backpack sprayer to gallons per acre.
Gallons per acre depends on nozzle flow, travel speed and spacing, combined through the standard calibration constant 5940. Applying the same mix at the wrong delivered volume changes the real dose, so calibrating the rig is the foundation of safe spraying.
Sprayer Calibration
GPA = (5940 x gpm) ÷ (speed x nozzle spacing)
GPA = (5940 x gpm) ÷ (speed x nozzle spacing) Gallons per acre depends on nozzle flow, travel speed and spacing, combined through the standard calibration constant 5940.
Applying the same mix at the wrong delivered volume changes the real dose, so calibrating the rig is the foundation of safe spraying.
This calculator takes 3 inputs: Nozzle flow, Travel speed, Nozzle spacing. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.